Case of the Month: April, 2011 Page 3

Answer: D: Cystic renal mass:The collecting system is visualized with contrast and is not dilated. The labs and symptoms do not suggest infection. Infarction and lymphoma typically give a striated hypodensities like appearance and not lobulated and cystic.

An ultrasound was also ordered for further characterization. Note the large cyst in the superior pole of the right kidney and relative normal appearance of the left kidney.